Connection Closed Error

1 . Recently we are getting some errors for the Adapters as(JDBC) :
(17008) Closed Connection"
Closed Connection in Service : .
Though on checking on the Admin screen it was found that the connection was up , no error poped up
when we re-stared the connection . The data base was up .
But running the adapter service gave connection closed error .

Above error was kind of transient … after some time we were able to successfully run the adapter service.

2 . Another problem :
Tried to create an notification service same server another Connection(JDBC), it gave error as :
Failed to run notificationLookupValues service. Details provided in error log.
[ADA.1.318] Cannot get the list of catalogs. "
(17008) Closed Connection"
Closed Connection
on tables.catalogName [Ljava.lang.String;@f55600

java.lang.Exception: Adapter values are not available.

Above two things were working fine till some time back .
we already have a notification created for the 2nd problem earlier.
Recently seen this problem , for things working fine earlier.

Can some on help , as what is the cause of the problem.

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Our Server configuration :

We are using wM version 6.5 for IS with following fixes :

IS_6-5_Fix4
IS_6-5_Fix7
IS_6-5_Fix12
IS_6-5_Fix14
IS_6-5_Fix22
IS_6-5_Fix27
IS_6-5_Fix30
IS_6-5_Fix31
IS_6-5_Fix32
IS_6-5_Fix35
TNS_6-5_Fix3
TNS_6-5_Fix10
TNS_6-5_Fix11
TNS_6-5_Fix15
IS_6-5_Fix61

and using JDBC Version 6.0.3 with update as : JDBC_6-0-3_FP1_Fix10.

Thanks.